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The previous system prompt asked GLM for a free-form "shot-by-shot" expansion, which reliably produced 4-5 fake cuts with timestamps running out to 8-10s — impossible for a clip fixed at ~5s (H3_GEN_PARAMS.frames / FPS). Rewrote it against docs/h3skill.md (MiniMax's own H3 prompt-writing methodology, added alongside this commit): every chat prompt has no reference images, so it's always T2VA mode, and at ~5s it's one continuous shot, never a montage. The new prompt asks for H3's actual three-field T2VA structure (integrated_multimodal_description / overall_soundscape / non_diegetic_music, fixed order and labels), a single dominant camera movement from the official vocabulary (type + amplitude + speed), concrete lighting (no hollow buzzwords like "8K"/"cinematic" alone), and — previously missing entirely — explicit sound design. Verified against the real GLM endpoint on several sample prompts: single continuous shot throughout, correct field structure, no more impossible multi-shot timestamps. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0144MiJ2cLjMd9jWaeEpVfUJ
